How low do you want to run? I'm running at about 220psi and getting 280fps with the velocity adjuster in 1/2 turn. When you first get your VS2, run it at around 250-275psi until the reg breaks in, which in my case took a few boxes of paint. Upgrading your reg and enlarging your LPC will allow you to operate at lower pressures. But go too low and you'll have problems with your recharge rate at high ROFs. I've heard some guys claim that they run at 180psi....I'm not sure if I believe them though.